Dogcows Code - chaz/tar/blob - scripts/level-0

   1 #!/bin/sh
   2 #
   3 # Run this script as root on the machine that has the tape drive, to make a
   4 # full (level-0) dump.
   5 #
   6 # If you give `now' as an argument, the dump is done immediately.
   7 # Otherwise, it waits until 1am, or until the hour given as argument.
   8 # Specify the hour as a number from 0 to 23.
   9 #
  10 # You must edit the file `backup-specs' to set the parameters for your site.
  11
  12 # Useful for backup-specs, in case things have to be done slightly
  13 # differently for different dump levels.
  14 DUMP_LEVEL=0
  15
  16 # Insure `mail' is in PATH.
  17 PATH="/usr/ucb:${PATH}"
  18 export PATH
  19
  20 # This is not the most reliable test in the world.  The following might be
  21 # more predictable:
  22 #
  23 # whoami="`whoami`"
  24 # euid="`sed -ne '/^'\"${whoami}\"':/{s/^[^:]*:[^:]*://;s/:.*//p;q;}' /etc/passwd`"
  25 # if [ "${euid}" != 0 ]; then ...
  26 #
  27 if [ ! -w / ]; then
  28    echo "The backup must be run as root or else some files will fail to be dumped."
  29    exit 1
  30 fi
  31
  32 # Get the values of BACKUP_DIRS, BACKUP_FILES, and other variables.
  33 . ./backup-specs
  34
  35 # Maybe sleep until around specified or default hour.
  36 if [ "${1}" != "now" ]; then
  37    if [ "${1}x" != "x" ]; then
  38       spec="${1}"
  39    else
  40       spec="${BACKUP_HOUR}"
  41    fi
  42
  43    pausetime="`date | awk '
  44      {
  45       hr = substr($4, 1, 2);
  46       mn = substr($4, 4, 2);
  47       if((hr + 0) < (spec + 0))
  48          print 3600 * (spec - hr) - 60 * mn;
  49       else
  50          print 3600 * (spec + (24 - hr)) - 60 * mn;
  51      }' spec=\"${spec}\"`"
  52
  53    clear
  54    echo "${SLEEP_MESSAGE}"
  55    sleep "${pausetime}"
  56 fi
  57
  58 # start doing things
  59
  60 # Put startdate in the subject line of mailed report, since if it happens
  61 # to run longer than 24 hours (as may be the case if someone forgets to put
  62 # in the next volume of the tape in adequate time), the backup date won't
  63 # appear too misleading.
  64 startdate="`date`"
  65
  66 here="`pwd`"
  67
  68 # Logfile name should be in the form  ``log-1993-03-18-level-0''
  69 # i.e. year-month-date.  This format is useful for sorting by name, since
  70 # logfiles are intentionally kept online for future reference.
  71 LOGFILE=log-`date | awk '
  72    BEGIN {
  73       d["Jan"] = "01";  d["Feb"] = "02"; d["Mar"] = "03";
  74       d["Apr"] = "04";  d["May"] = "05"; d["Jun"] = "06";
  75       d["Jul"] = "07";  d["Aug"] = "08"; d["Sep"] = "09";
  76       d["Oct"] = "10";  d["Nov"] = "11"; d["Dec"] = "12";
  77    }
  78    {
  79     if ($3 < 10)
  80        $3 = "0" $3;
  81     print $6 "-" d[$2] "-" $3;
  82    }'`-level-${DUMP_LEVEL}
  83
  84 localhost="`hostname | sed -e 's/\..*//'`"
  85
  86 TAR_PART1="/usr/local/bin/tar -c --multi-volume --one-file-system --block=${BLOCKING} --sparse --volno-file=${VOLNO_FILE}"
  87
  88 # Only use --info-script if DUMP_REMIND_SCRIPT was defined in backup-specs
  89 if [ "x${DUMP_REMIND_SCRIPT}" != "x" ]; then
  90    TAR_PART1="${TAR_PART1} --info-script='${DUMP_REMIND_SCRIPT}'"
  91 fi
  92
  93 # Make sure the log file did not already exist.  Create it.
  94
  95 if [ -f "${LOGFILE}" ] ; then
  96    echo "Log file ${LOGFILE} already exists." 1>&2
  97    exit 1
  98 else
  99    touch "${LOGFILE}"
 100 fi
 101
 102 # Most everything below here is run in a subshell for which all output is
 103 # piped through `tee' to the logfile.  Doing this, instead of having
 104 # multiple pipelines all over the place, is cleaner and allows access to
 105 # the exit value from various commands more easily.
 106 (
 107  # Caveat: Some version of `mt' require `-t', not `-f'.
 108  mt -f "${TAPE_FILE}" rewind
 109  rm -f "${VOLNO_FILE}"
 110
 111  set - ${BACKUP_DIRS}
 112  while [ $# -ne 0 ] ; do
 113     date="`date`"
 114     remotehost="`echo \"${1}\" | sed -e 's/:.*$//'`"
 115     fs="`echo \"${1}\" | sed -e 's/^.*://'`"
 116     fsname="`echo \"${1}\" | sed -e 's/\//:/g'`"
 117
 118     # This filename must be absolute; it is opened on the machine that runs tar.
 119     TAR_PART2="--listed=/etc/tar-backup/temp.level-0"
 120     TAR_PART3="--label='Full backup of ${fs} on ${remotehost} at ${date}' -C ${fs} ."
 121
 122     echo "Backing up ${1} at ${date}"
 123
 124     # Actually back things up.
 125
 126     if [ "z${localhost}" != "z${remotehost}" ] ; then
 127        rsh "${remotehost}" mkdir /etc/tar-backup > /dev/null 2>&1
 128        rsh "${remotehost}" rm -f /etc/tar-backup/temp.level-0
 129        rsh "${remotehost}" ${TAR_PART1} -f "${localhost}:${TAPE_FILE}" ${TAR_PART2} ${TAR_PART3}
 130     else
 131        mkdir /etc/tar-backup > /dev/null 2>&1
 132        rm -f /etc/tar-backup/temp.level-0
 133        # Using `sh -c exec' causes nested quoting and shell substitution
 134        # to be handled here in the same way rsh handles it.
 135        sh -c "exec ${TAR_PART1} -f \"${TAPE_FILE}\" ${TAR_PART2} ${TAR_PART3}"
 136     fi
 137
 138     # `rsh' doesn't exit with the exit status of the remote command.  What
 139     # stupid lossage.  TODO: think of a reliable workaround.
 140     if [ $? -ne 0 ] ; then
 141        echo "Backup of ${1} failed." 1>&2
 142        # I'm assuming that the tar will have written an empty
 143        # file to the tape, otherwise I should do a cat here.
 144     else
 145        if [ "z${localhost}" != "z${remotehost}" ] ; then
 146          rsh "${remotehost}" mv -f /etc/tar-backup/temp.level-0 "/etc/tar-backup/${fsname}.level-0"
 147        else
 148          mv -f /etc/tar-backup/temp.level-0 "/etc/tar-backup/${fsname}.level-0"
 149        fi
 150     fi
 151     ${TAPE_STATUS}
 152     sleep 60
 153     shift
 154  done
 155
 156  # Dump any individual files requested.
 157
 158  if [ "x${BACKUP_FILES}" != "x" ] ; then
 159     date="`date`"
 160
 161     TAR_PART2="--listed=/etc/tar-backup/temp.level-0"
 162     TAR_PART3="--label='Full backup of miscellaneous files at ${date}'"
 163
 164     mkdir /etc/tar-backup > /dev/null 2>&1
 165     rm -f /etc/tar-backup/temp.level-0
 166
 167     echo "Backing up miscellaneous files at ${date}"
 168
 169     # Using `sh -c exec' causes nested quoting and shell substitution
 170     # to be handled here in the same way rsh handles it.
 171     sh -c "exec ${TAR_PART1} -f \"${TAPE_FILE}\" ${TAR_PART2} ${TAR_PART3} ${BACKUP_FILES}"
 172
 173     # `rsh' doesn't exit with the exit status of the remote command.  What
 174     # lossage.  TODO: think of a reliable workaround.
 175     if [ $? -ne 0 ] ; then
 176       echo "Backup of miscellaneous files failed."
 177       # I'm assuming that the tar will have written an empty
 178       # file to the tape, otherwise I should do a cat here.
 179     else
 180       mv -f /etc/tar-backup/temp.level-0 /etc/tar-backup/misc.level-0
 181     fi
 182     ${TAPE_STATUS}
 183  else
 184     echo "No miscellaneous files specified"
 185  fi
 186
 187  # Caveat: some versions of `mt' use `-t' instead of `-f'.
 188  mt -f "${TAPE_FILE}" rewind
 189  mt -f "${TAPE_FILE}" offl
 190
 191 ) 2>&1 | tee -a "${LOGFILE}"
 192
 193 echo "Sending the dump log to ${ADMINISTRATOR}"
 194 mail -s "Results of backup started ${startdate}" ${ADMINISTRATOR} < "${LOGFILE}"
 195
 196 # eof